source: Arbeitsblatt DVGW G 260(A)

Gas composition (molar fraction):
methane: 90.94%
nitrogen: 0.69 %
carbon dioxide: 2.68 %
oxygen: 0.19 %
propane: 5 %
butane: 0.5 %


Wobbe-Index (normal conditions) : 14.9 KWh/m³
HHV (normal conditions) : 11.6 KWh/m³